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116 FOR RESIDENCE BUILDINGS NOT EXCEEDING THIRTY—FIVE FEET IN HEIGHT, THE MINIMUM THICKNESS OF SOLID MASONRY BEARING WALLS MAY BE EIGHT INCHES THROUGHOUT. FOR BUILDINGS AND STRUCTURES IN ALL USE GROUPS WHICH ARE MORE THAN • THIRTY—FIVE (35) FEET IN HEIGHT, THE MINIMUM THICKNESS OF SOLID MASONRY WALLS SHALL BE TWELVE (12) INCHES FCR THE UPPERMOST FORTY (410) FEET OF HEIGHT, INCREASING AN ADDITIONAL FOUR (4) INCHES FOR EACH SUCCESSIVE THIRTY—FIVE (35) FEET OR FRACTION THEREOF. THE THICKNESS OF STONE ASHLAR OR SOLiL STONE WALLS SHALL NOT BE LESS THAT: THAT REQUIRED BY THIS SECTION EXCEPT THAT RUBBLE STONE WALLS SHALL BE FOUR (4) INCHES THICKER FOR THE SAME RESPECTIVE HEIGHTS, BUT IN NO CASE LESS THAN SIXTEEN(16) INCHES THICK. THE THICKNESS HEREIN PRESCRIBED FOR BEARING WALLS MAY BE DECREASED FOUR (4) INCHES IN NON—BEARING WALLS; BUT SHALL NOT BE LESS THAN A MINIMUM OF EIGHT (8) INCHES EXCEPT WHERE SIX (6) INCH WALLS ARE SPECIFICALLY PERraITTED IN THIS ARTICLE. IN ONE FAMILY DWELLINGS AND PRIVATE GARAGES NOT OVER ONE STORY OR NINE (9) FEET IN HEIGHT, THE MINIMUM THICKNESS SHALL BE SIX (6) INCHES; EXCEPT THAT IN GABLE CONSTRUCTION, SIX (6) INCH WALLS SHALL BE PERMITTED THROUGHOUT, WHEN THE HEIGHT TO THE PEAK OF THE GABLE DOES NOT EXCEED FIFTEEN (15) FEET. INTERIOR MASONRY BEARING PARTITIONS SHALL BE OF SUFFICIENT THICKNESS TO SUPPORT ALL SUPERIMPOSED LOADS WITHOUT EXCEEDING THE WORKING STRESSES SPECIFIED FOR THE MATERIALS OF CONSTRUCTION; BUT IN NO CASE SHALL THE Url— SUPPORTED HEIGHT EXCEED TWENTY—FIVE (25) TIMES THE THICKNESS OF THE PARTITION • UNLESS REINFORCED WITH PIERS, BUTTRESSES OR BY OTHER APPROVED MEANS. INTERIOR NON—BEARING PARTITIONS SHALL BE CONSTRUCTED SOLIDLY BET'vEEN FLOOR AND CEILING CONSTRUCTION AND ANCHORED THERETO ABOVE AND BELOW; BUT THE MAXIMUM UNSUPPORTED HEIGHT SHALL NOT EXCEED THIRTY—SIX (36) TIMES THE THICKNESS, UNLESS REINFORCED TO PROVIDE SUFFICIENT STABILITY. WHEN STIFFENED BY CROSS—WALLS, PIERS OR BUTTRESSES NOT LESS THAN TWENTY— FOUR (24) INCHES DEEP AT HORIZONTAL INTERVALS NOT MORE THAN TWENTY (2) FEET, FOR BUILDINGS AND STRUCTURES IN ALL USE GROUPS, THE MINIMUM THICKNESS SHALL BE TWELVE (12) INCHES FOR THE UPPERMOST SIXTY (60) FEET, INCREASING THE THICKNESS OF WALLS AND PIERS FOUR (4) INCHES ADDITIONAL FOR EACH SUCCESSIVE FIFTY—FIVE (55) FEET OR -'PORTION THEREOF. ABOVE THE ROOF LEVEL, MASONRY WALLS OF PENTHOUSES AND BULKHEADS, NOT OVER TWELVE (12) FEET IN HEIGHT, SHALL BE NOT LESS THAN EIGHT (8) INCHES THICK. SUCH WALLS MAY BE CONSIDERED AS NEITHER INCREASING THE HEIGHT NOR REQUIRING INCREASED THICKNESS OF THE UNDERSTRUCTURE WALLS. THE MINIIVUM THICKNESS OF PLAIN CONCRETE WALLS MAY BE TWO (2) INCHES LESS THAN THAT REQUIRED FOR SOLID MASONRY WALLS; BUT IN NO CASE SHALL SUCH WALLS BE LESS THAN EIGHT (0) INCHES THICK, EXCEPT WHERE SIX (6) INCH WALLS ARE PERMITTED IN ONE (1) STORY RESIDENCE BUILDINGS AND PRIVATE GARAGES., THE MINIMUM THICKNESS OF HOLLOW UNIT MASONRY WALLS, BEARING AND NON— BEARING, SHALL BE NOT LESS THAN THAT REQUIRED FOR SOLID MASONRY WALLS9 WALLS OF STRUCTURAL CLAY TILE OR HOLLOW CONCRETE MASONRY UNITS SHALL NOT EXCEED FIFTY (50) FEET IN HEIGHT ABOVE THE FOUNDATIONS OR SUPPORTS OF SUCH WALLS OR PORTIONS OF WALLS. VNEN WALLS OF HOLLOW MASONRY ARE DECREASED IN THICKNESS, THE TOP COURSE UNITS OF THE THICKER WALL SHALL BE FILLED SOLIDLY WITH APPROVED CONCRETE OR COVERED WITH THE EQUIVALENT OF ONE COURSE OF SOLID MASONRY. THE FACING AND BACKING OF CAVITY WALLS SHALL EACH BE NOT LESS THAN FOUR (4) INCHES THICK AND THE CAVITY SHALL BE NOT LESS THAN TWO (2) INCHES NOR MORE THAN THREE (3) INCHES THICK. CAVITY BEARING WALLS SHALL BE L1r.PITED TO THE SAME HEIGHTS AS HOLLOW BEARING • WALLS. APPROVED FLASHING AROUND OPENINGS, AND MEANS OF DRAINING THE CAVITY SHALL BE PROVIDED TO PREVENT WATER FROM ACCUMULATING IN THE CAVITY AND DAMPNESS FROM PASSING THROUGH THE BACKING; AND PRECAUTIONS SHALL BE TAKEN DURING CON— STRUCTION TO KEEP THE CAVITY CLEAR OF MORTAR—DROPPINGS, SOLID MASONRY CURTAIN WALLS SHALL BE NOT LESS THAN EIGHT (8) INCHES THICK FOR THE UPPERN10ST TWENTY—FOUR (24) FEET OF HEIGHT AND SHALL BE INCREASED AN ADDITIONAL FOUR (4) INCHES IN THICKNESS FOR EACH SUCCESSIVE LOWER SIXTY (60) FEET IN HEIGHT OR FRACTION THEREOF. CURTAIN WALLS OF HOLLOW UNITS OR HOLLOW WALL CONSTRUCTION OF SOLID UNITS SHALL BE NOT LESS THAN EIGHT (8) INCHES THICK FOR THE UPPERMOST EIGHTEEN (18) FEET IN HEIGHT, AND SHALL BE INCREASED AN ADDITIONAL FOUR (4) INCHES IN THICKNESS FOR EACH SUCCESSIVE LOWER FIFTY (5) FEET INCREASE IN HEIGHT OR FRACTION THEREOF* WHEN THE HORIZONTAL DISTANCE BETWEEN LATERAL SUPPORTS IN CURTAIN WALLS IS GREATER THAN TWENTY—FIVE (25) FEET, THE THICKNESS OF THE CURTAIN WALLS SHALL BE INCREASED FOUR (4) INCHES FOR EACH TEN (10) FEET OR FRACTION THEREOF OF SUCH EXCESS* • ALL CURTAIN WALLS SHALL BE ANCHORED WITH APPROVED METAL ANCHORS AT EACH STORY AND AT INTERVALS OF NOT MORE THAN TWENTY—FIVE FEET HORIZONTALLY TO THE